At which stage of second language acquisition do learners typically display excellent comprehension with few grammar mistakes?

Learners at the intermediate fluency stage demonstrate excellent comprehension of the second language and make few grammatical errors. At this stage, they are able to understand and produce complex sentences, and their vocabulary is significantly expanded compared to earlier stages. They engage more confidently in conversations and grasp nuances of the language, which allows for more complex discussions and a deeper understanding of the language's structure.

This stage follows the early production phase, where learners might still struggle with grammatical accuracy and have limited vocabulary. The intermediate fluency stage indicates a shift towards greater language proficiency and the ability to use the language more naturally, further enhancing communication with native speakers.

Understanding this progression clarifies why comprehension and grammatical accuracy significantly improve as learners move through the stages of language acquisition.